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Math Help - Limits of 2 and 3 variable equations

  1. #1
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    Limits of 2 and 3 variable equations

    Hi all,

    I have a couple of problems I am stuck on. I'm never been great with limits, so trying to learn them in 3 and 4 dimensions is a challenge:

    Find the limit (or prove that it does not exist) for the following:

    lim (x,y)-->(0,0) of xy^4/(x^2+y^8)

    lim (x,y,z)-->(0,0,0) of (xy+yz+zx)/(x^2+y^2+z^2)

    Thanks in advance!
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  2. #2
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    Re: Limits of 2 and 3 variable equations

    Bump. Any hints or tips?
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  3. #3
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    Re: Limits of 2 and 3 variable equations

    Try converting to polars for the first.
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